Lesson 13 — Error Handling

日本語

Syntax

Raise errors with throw, handle them with try / catch (and optional finally):

fn risky
  throw new Error[//;something went wrong;//]

try
  risky[]
catch e
  console.log[e.message]
finally
  cleanup[]

try also works as an expression:

const result be try
  risky[]
catch e
  default-value

Task

1. Make safe-divide throw new Error[//;division by zero;//] when b eq 0.

2. Make try-divide wrap the call in try/catch and return //;error: [e.message];// on error.

Check

npm test 13

Learn more

• Control Flow — try / catch / finally